There are not really any unittest that tests this functionality so this is not caught but the following examples have changes since 1.5.0

• inset_locator_demo1

1.5.0

Master

• inset_locator_demo2

1.5.0

Master

(http://matplotlib.org/devdocs/mpl_toolkits/axes_grid/examples/inset_locator_demo2.png)

• simple_axisline4

1.5.0

Master

• Simple anchored artists

1.5.0

Master

It's likely that this is only one or two issues.